Thread drawing machine



Dec. 18, 1934. A.\THOMAS THRE AD DRAWING MACHINE Filed Jan. 31', 1935 2 Sheets-Sheet l Filed Jan. 51, 1933 2 Sheets-Sheet 2 Dec. 18, 1934.

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Patented Dec. 18, 1934 UNITED STATES PATENT OFFICE THREAD DRAWING MACHINE Germany Application January 31 In Germany Claims.

This invention relates to thread drawing ma- 5 draw the material before the drawing blade pierces the material.

Another object is to provide means especially adapted for tightly drawing elastic materials.

Still another object is to construct a device which does not damage thin materials.

A further object is to provide a special presserbar the feet of which gradually stretch the material.

Another object is to construct these presser-bar feet adapted to spread themselves.

Another object is to construct these presserbar feet of elastic material.

With these and incidental objects in view, the invention consists in certain novel features of construction and combination of parts, the essential elements of which are set forth in the appended claims, and a preferred form of embodiment is hereafter described with reference to the drawings which accompany and form part of the specification,

Of said drawings Figure 1 is a front elevation;

Figure 2 is a side elevation;

Figure 3 is a section on the line 3-3 of Figure 1;

Figures 4 to 6 show the presser-bar feet in different positions;

Figure '7 is a front elevation with the walls of the arm partially broken away;

Figure 8 is a side elevation with the plate covering the head of the arm removed to show the inner parts.

Referring to the drawings the invention may be described in detail as follows:

Besides the normal presser-foot l cooperating with the feeding mechanism there is provided a second special presser foot. In the illustrated form of embodiment, the head 2 of this special presser-foot is of metal and the feet 3 pressing on the material are of elastic material, for instance of rubber. These feet are bent outward in such a way, that while this second presser-bar goes down, the ends of the feet 3 first press the material and then spread and in this manner tightly draw the material before the drawing blade 12 pierces, as shown in Figures 4 to 6.

The presser-bar head 2 is fastened to the presser-bar 11. This presser-bar 11 is driven in the following way:

, 1933, Serial No. 654,532

March 3, 1932 Rigidly mounted on shaft 4 is a cam disc 5 (Figs. 3 and 7). A roller 21 of an arm 6 engages the cam groove 22 of said cam disc 5. The arm 6 is fastened to a shaft '7 rotatably mounted in the arm 23 of the machine (Fig. 1). On the other end of shaft 7 there is fixed a second arm 8. A pin 9 of arm 8 engages the forked end of a block 10 rigidly connected to the presser-bar 11.

The cam groove 22 is so timed, that the presserbar 11 has moved down a short time, before the drawing blade 12 pierces the material. The head 2 of the special presser-foot is adjustable in height in a well known manner by a screw 31.

The blade 12 is fastened to a blade-bar 25 which in well known manner is driven by an actuating crank 26 pivotally connected to a drive wheel 2'7 fixed on main shaft 4. g

The main shaft 4 is driven by motor or human power in the usual way.

What I claim is:

1. In a machine of the class described, 2. normal presser-bar, a second presser-bar, a metal head on said second presser-bar, feet of rubber in said head, said feet being bent outward.

2. In the combination as claimed in claim 1, said rubber feet of said second presser-bar being bent in a slight curvature in undepressed position and in a sharp curvature in depressed position.

3. In the combination as claimed in claim 1, said rubber feet of said second presser-bar being parallel to the presser-feet of said normal presser-bar.

4. In a thread drawing machine, a normal presser-bar, presser-feet on said normal presserbar constantly pressing against the material, a second presser-bar, a head on said second presser-bar, presser-feet on said head, the head of said second presser-bar embracing the feet of said normal presser-bar in the form of a yoke, a drawing blade, and means to impart vertically reciprocating movements to said second presserbar and to said drawing-blade during the machine operation.

5. In a machine of the class described, a normal presser-bar, a second presser-bar, presserfeet on said first and on said second presserbar, each of said presser-feet of said second presser-bar having a separate axis of turning movement, said axis being parallel to the feet 50 of said first presser-bar.

AUGUST THOMAS. 

